Locking device for coal-cutting trucks



M. KRUPA. LOCKING DEVICE ron COAL CUTTING TRUCKS.

APPLICATION FILED DEC-4,1917.

Patented Aug. 5, 1919.

ITED STATES PATENT OFFICE.

MICHAL KRUPA, OF JEROME, PENNSYLVANIA, ASSIGNOR 0F ONE-FOURTH TO JOSEPH DZIN GEL, 0F JEROME, PENNSYLVANIA.

LOCKIN G DEVICE FOR COAL-CUTTING TRUCKS.

Specification of Letters Patent.

Patented Aug. 5, 1919.

Application filed December 4, 1917. Serial N 0. 205,320.

To all whom it may concern:

Be it known that I, MICHAL Know, a subject of the Emperor of Austria, resident of Jerome, county of Somerset, and State of Pennsylvania, have invented certain new and useful Improvements in Locking Devices for Coal-Cutting Trucks, of which the following is a specification.

This invention relates to improvements in coal cutters and more particularly to novel means for holding the cutting mechanism in fixed position. My invention is designed for use in conjunction with types of cutting machines for extracting coal from mines which are mounted upon trucks, and the means provided in the present improvement for holding the machine in one position at a time consists of an adjustable device mounted upon the platform of the truck and adapted to engage with the top of the mine,

as will readily be appreciated.

These and other like objects are attained by the novel construction and combination of parts hereinafter described and shown in the accompanying drawings, forming a material part of this specification, and in which Figure 1 is a vertical sectional View.

Fig: 2 is an enlarged vertical sectional View taken through the machine securing means, and

Fig. 3 is a plan and sectional View, the section being taken on line 66 of Fig. 2.

In the drawings, the numeral 10 indicates the rails of a track-way disposed within a mine, upon which is mounted a truck 11, upon wheels 12, suited to the track and carried by the track and carried by the truck 11, is a platform 15, carrying the picks of a coal cutter mechanism illustrated but forming no part of my present invention.

In order to hold the apparatus in position while the picks are operating, a footing 42 is secured on top of the latform 15, the same supporting a threadecFstem 43, extending vertically upward and slidably engaging within an opening 44, formed in the cylindrical contacting plug 45, the head of which may engage with the top of the drift or mine when it is desired to hold the truck .rigid.

Gopies of this patent may be obtained for five cents each, by addressing the In order to adjust the height of the plug 45 relative to the screw 43, a disk 48 having operating handles 49, is formed with an opening 50 through which the screw 48 passes and a lateral recess 51, extended therefrom in which is engaged a block 53, the inner end of the block having teeth engageable with the screw thread 43, so that the disk operates in the manner of a nut.

'Means for operating the block is provided by the screw stem 54, formed with the head 55, which may be operated in a manner similar to the extending handle 49.

Obviously when the block 53 is moved outwardly, the plug can be freely moved up or down upon the screw 43 and when the plug 53 is engaged with the screw, the disk 48 can be used as a nut, locking the machine in its adjusted position.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is

In combination, a support, a verticallyextending threaded stem secured upon said support, a sleeve longitudinally slidable upon said threaded stem, a disk formed with a central enlarged opening in which said stem is adapted to project loosely, said opening being formed with a lateral enlargement to provide a radial recess, a block slidable in said recess enlargement and formed with an arcuate surface having teeth, a plurality of handle bars mounted radially of said disk, and carrying balls upon their free ends, a screw-bolt threaded into said disk and ad vaneeable therein, said screw bolt having a head rotatably secured in said block so as to support said block within said recess, and a ball head upon said screw-bolt, said screwbolt adapted to move said head within said recess enlargement and so that its teeth may mesh with the threads of said stem whereupon said disk may screw upon said stem, said disk supporting said sleeve.

In testimony whereof I have signature.

"Commissioner of Patents,

Washington, D. t7." 

